[1] Haga Teaching Hospital,Department of Internal Medicine
[2] Leiden University Medical Center,Department of Infectious Diseases
[3] Alrijne Hospital,Department of Internal Medicine
[4] Bronovo Hospital,Department of Internal Medicine
[5] Leiden University Medical Center,Department of Public Health and Primary Care
[6] Primary Health Care Center,Department of Internal Medicine
[7] Medical Center Haaglanden,Department of Internal Medicine
[8] Groene Hart Hospital,Department of Internal Medicine
[9] Alrijne Hospital,Department of Medical Microbiology
[10] Leiden University Medical Center,undefined
[11] National Institute for Public Health and the Environment (RIVM),undefined
[12] Centre for Infectious Disease Control (CIb),undefined